<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		手机号码:<input type="text" id="input1" />

		<script>
			input1.onkeydown = function(e) {
				console.log("键盘按钮下")
				console.log(e.key);
				console.log(e.keyCode);
				if (e.keyCode < 48 || e.keyCode > 57) {
					// 阻止元素的默认行为
					event.preventDefault()
				}
			}

			input1.onkeyup = function(e) {
				console.log("键盘抬起")
			}

			input1.onkeypress = function(e) {
				console.log("键盘按了")
			}

			// 只能输入数字不能输入其他字母
		</script>
	</body>
</html>
